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Electromagnetic switch

a technology of electromagnetic switch and spring constant, which is applied in the direction of magnets, contact mechanisms, magnets, etc., can solve the problems of large impact noise or a large crashing sound, impact noise becomes an obstacle, etc., and achieves small spring constant, reduce spring constant, and increase damping (or attenuation coefficient

Inactive Publication Date: 2007-08-23
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]It is an object of the present invention to provide an improved electromagnetic switch capable of suppressing propagation of loud crashing sound and of reducing operation noise generated when a plunger (as a movable iron core) is attracted to and then collides with a stationary iron core.

Problems solved by technology

However, a conventional electromagnetic switch causes a large impact noise or a large crashing sound when the plunger is attracted to and collides with the stationary iron core by the energized electromagnet.
This impact noise becomes an obstacle to perform the silent engine start.

Method used

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first embodiment

[0039]A description will be given of the electromagnetic switch according to the first embodiment of the present invention with reference to FIG. 1 to FIG. 4.

[0040]FIG. 1 is a sectional view showing a configuration of a stationary iron core 5 of the electromagnetic switch 1 according to the first embodiment of the present invention. FIG. 2 is a sectional view showing another configuration of the stationary iron core 5 of the electromagnetic switch 1 according to the first embodiment. FIG. 3 is a sectional view showing an entire configuration of the electromagnetic switch 1 according to the first embodiment.

[0041]The electromagnetic switch 1 according to the first embodiment is applied to a starter (not shown) mounted on a vehicle, for example. The starter is capable of starting an internal combustion engine mounted on the vehicle. As shown in FIG. 3, the electromagnetic switch 1 has a solenoid 2 forming an electromagnet by which a main contact, described later in detail, mounted on ...

second embodiment

[0061]A description will be given of the electromagnetic switch according to the second embodiment of the present invention with reference to FIG. 5 and FIGS. 6A and 6B.

[0062]FIG. 5 is a sectional view showing a configuration of the stationary iron core 505 in the electromagnetic switch according to the second embodiment of the present invention. FIG. 6A is a plan view showing a configuration of the metal plate 551a having slits 52, and FIG. 6B is a plan view showing a configuration of the metal plate 552a′ having holes 53.

[0063]As shown in FIG. 5, the disk part 551 forming the stationary iron core 505 in the electromagnetic switch according to the second embodiment is composed of a plurality of metal plates (for example, iron plates) that are laminated. In the configuration shown FIG. 5, the stationary iron core 505 has a pair of the metal plates 551a. Further, at least one metal plate 551a has slits 52, as shown in FIG. 6A, or at least one metal plate 551a′ has holes 53, as shown ...

third embodiment

[0068]A description will be given of the electromagnetic switch according to the third embodiment of the present invention with reference to FIG. 7 and FIG. 8.

[0069]FIG. 7 is a partial view showing a configuration of the electromagnetic switch according to the third embodiment of the present invention. FIG. 8 is a plan view showing a configuration of a disk part 751 forming the stationary iron core in the electromagnetic switch according to the third embodiment.

[0070]As shown in FIG. 7, each of the plural metal plates forming the disk part 751 of the stationary iron core has the slits 52 or the holes 53s, like the configuration of the second embodiment which has been explained with reference to FIGS. 6A and 6B. Further, a plurality of the plural metal plates 551a (see FIG. 6A) or 551a′ (see FIG. 6B) are laminated and the plural silts 52 (or the holes 53) form penetrating holes which penetrate through the entire of the plural metal plates 551a (see FIG. 6A) or 551a′ (see FIG. 6B). It...

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Abstract

In an electromagnet switch, a stationary iron core is composed mainly of a base part and a disk part. The base part is faced to a plunger and the disk part is forcedly inserted and fixed to a boss part formed in the base part. The disk part is composed of a metal plate of ferromagnetic substance (iron plate) and another substance plate (made of resin or rubber and the like, for example,) of a smaller spring constant or a larger damping coefficient than that of the metal plate. The metal plate and another substance plate are laminated. Another substance plate absorbs or reduces the impact force when the plunger is electromagnetically attracted toward and collides with the base part. The propagation of a large impact noise or crashing sound is thereby suppressed, and as a result the impact noise can be reduced.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is related to and claims priority from Japanese Patent Applications No. 2006-47026, filed on Feb. 23, 2006, No. 2006-181362, filed on Jun. 30, 2006, and No. 2006-231875, filed on Aug. 29, 2006, the contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an electromagnetic switch capable of turning on and turning off an electric contact mounted on an energized electric circuit of a starter motor.[0004]2. Description of the Related Art[0005]In order to satisfy recent demand of reducing the fuel consumption for saving energy in vehicles, an automatic engine-stop system is adopted to many vehicles. For example, when a driver stops his vehicle at an intersection when the stop lamp (red or yellow lamp) of a traffic signal is lighting, the automatic engine-stop system mounted on the vehicle controls so that the vehicle is automaticall...

Claims

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Application Information

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IPC IPC(8): H01H67/02
CPCH01H51/065H01H50/305
Inventor KURASAWA, TADAHIROUSAMI, SHINJITERAMACHI, TOMOHIRO
Owner DENSO CORP
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